This will set the database containment type from "None" to "Partial". By default your database is set to "None."

Go to the Security folder under your database.

Right click the Security folder and choose "New User..."

Choose "SQL user with a password" for the User Type.

Enter the password for this contained DB User.

On the "Select a page" column click "Membership."

Click on the db_owner.

When logging into the SQL server using SQL Server Management Studio, you will need to ensure that default database connection is set to point to your database. If you leave it in its default state, SQL Server Management Studio will automatically try to authenticate to the Master database which will generate an error.